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John, I run them tighter until the bore gets large enough and the piston short enough that after a few thousand miles of use the piston rock takes up a bit of the quench. From what I've seen, which is limited I admit... Once you're past the 440 +.030 bore the pistons can rock a bit. Add to that the loss in skirt and stability from the stroked crank and the extra sideways pushing.... I want to make sure nothing hits after a bunch of miles. No other reason than that. But remember I'm starting at .030. Guys starting at .040 dont have to worry. As things wear, that distance gets tighter as the piston changes direction.



Thanks Dave , the engines I'm working on are stock stroke /stock rod so I don't need to be concerned. Any strokers I am building are open chamber but Hi compression and the quench distance isn't close enough to be a concern with piston rock high compression and